RichTek Manuals

The RT9170 is a CMOS ultra low quiescent current and low dropout (ULDO) regulator. The device is capable of supplying 300mA of output current continuously. The RT9170's performance is optimized for battery-powered systems to deliver 15µA ultra low quiescent current and extremely low dropout voltage. Regulator ground current increases only slightly in dropout, further prolonging the battery life. Other features include ultra low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. The device is available in fixed output voltages range of 1.2V to 3.3V with 0.1V per step. The RT9170 regulators are available in SOT-23-3, SOT-23-5 and DIP-8 packages.

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The RT9184A is a dual-channel LDO regulator from richtek with low quiescent current, low dropout voltage, high accuracy, large current and other features. It is suitable for CD/DVD-ROM, CD/RW, wireless LAN card/keyboard/mouse, battery-powered equipment, XDSL router and other applications.

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The RT8800/B is Richtek's multi-phase synchronous buck controller dedicated to high-density power supply regulation. The device can implement 2, 3 buck switching stages, which operate in interleaved phase set automatically. The output voltage is regulated and controlled following the input voltage of FB pin. Such a single analog control provides a simple, flexible, wide-range and extreme cost-effective high-density voltage regulation solutions for various high-density power supply application. The RT8800/B multi-phase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors. The high equivalent operating frequency also reduces the component dimension and the output voltage ripple in load transient. RT8800/B implement both voltage and current loops to achieve good regulation, response and power stage thermal balance. The RT8800/B apply the time sharing DCR current sensing technology newly as well; with such a topology, the RT8800/B extract the DCR of output inductor as sense component to deliver a more precise load line regulation and better thermal balance capability. Moreover, the parts monitor the output voltage for over-current and over-voltage protection; Soft-start and programmable under-voltage lockout are also provided to ensure safe and reliable operation.

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RT9161/A is a 300/500mA fixed output voltage low dropout linear regulator. Typical ground current is approximately 110μA, from zero to maximum loading conditions. Wide range of available output voltage fits most of applications. Built-in output current-limiting and thermal-limiting provide maximal protection against any fault conditions. For ease of application, the RT9161/A comes in the popular 3-pin SOT-23 (300mA), SOT-89 (300mA), SOT-223 (500mA), or TO-92 packages. Applications include voltage regulators for LAN Card, CD-ROM, and DVD, wireless communication systems, and battery powered systems.

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RT9169/H is a 100mA ultra-low quiescent current CMOS low dropout (LDO) regulator designed for battery-powered equipments. The output voltages range from 1.2V to 5V with 0.1V per step. The other features include 4μA ultra-low quiescent, low dropout voltage, high output accuracy, current limiting protection, and high ripple rejection ratio.

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The RT9002A/B/C is a dual-channel, low noise, and low dropout regulator from Richtek. It features low quiescent current, wide operating voltage range, ultra-fast transient response, tight load and line regulation, current limiting/thermal protection and high ripple rejection ratio.

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RT9179 is a high performance linear voltage regulator with enable high function and adjustable output with a 1.175V reference voltage from Richtek. It operates from an input of 3V to 5.5V and provides output current up to 300mA with two external resistors to set the output voltage ranges from 1.175V to 4.5V. The RT9179 has superior regulation over variations in line and load. Also it provides fast respond to step changes in load. Other features include over-current and over- temperature protection. The device has enable pin to reduce power consumption in shutdown mode. The devices is available in the popular SOT-23-5 package.

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The RT9177 is a 200mA low dropout and low noise micro-power regulator suitable for portable RF applications. The output voltage accuracy within ±2% and range from 2.4V to 3.2V in 100mV increments could be selected. It is designed for using very low ESR output capacitor. Its output remains stable even in using 1µF ceramic as its output capacitor. Using an internal PMOS as the pass device cause that don’t need extra GND current in heavy load and dropout conditions. In shutdown mode, nearly zero operation current cause the IC is suitable for battery-power devices. Other features including current limiting, over temperature protection and adding a capacitor in bypass pin to improve its noise performance are functional.

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The RT9818 is a micro-power voltage detector from Richtek that supervises the power supply voltage level for microprocessors (μP) or digital systems. It provides internally fixed threshold levels ranging from 1.2V to 5V with 0.1V per step, which covers most digital applications. It features low supply current of 3μA. The RT9818 performs supervisory function by sending out a reset signal whenever the VDD voltage falls below a preset threshold level. This reset signal will last the whole period before VDD recovering. Once VDD recovered upcrossing the threshold level, the reset signal will be released after a certain delay time. RT9818 is provided in SC-82, SC-70-3, SOT-23-3, SOT-23-5 and SOT-89 packages.

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The RT9401A/B are digital to analog converters which generate a reference voltage for Intel VR10.x/AMD K8 5-bit VID code respectively. The parts are proposed to pair with a series of RichTek's general purpose PWM controllers dedicated for the desktop microprocessor core power voltage regulation. The reference voltage is within 1% high accuracy. These parts use a small footprint package of SOT-23-8.

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The RT9161/A is a 300/500mA fixed output voltage low dropout linear regulator. Typical ground current is approximately 110μA, from zero to maximum loading conditions. Wide range of available output voltage fits most of applications. Built-in output current-limiting most thermal-limiting provide maximal protection against any fault conditions. For ease of application, the RT9161/A comes in the popular 3-pin SOT-23 (300mA), SOT-89 (300mA), SOT-223 (500mA), or TO-92 packages.

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